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Finding the Fourth Proportional to 139.47, 208.95 and 84.52

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Solution

The fourth proportional to 139.47, 208.95 and 84.52 is: 126.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.47 : 208.95 = 84.52 : x
  2. Step 2: Convert to fraction form
    139.47/208.95 = 84.52/x
  3. Step 3: Cross multiply
    139.47x = 208.95 × 84.52
  4. Step 4: Simplify right side
    139.47x = 17,660.45
  5. Step 5: Solve for x
    x = 17,660.45/139.47
  6. Step 6: Final answer
    x = 126.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.